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Financial instruments (Tables) | 6 Months Ended
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Jun. 30, 2022
Disclosure of financial liabilities [line items] |
Schedule of financial liabilities measured at fair value | Financial liabilities at fair value through profit and loss:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2022 | ​ | December 31, 2021
​ | ​ | £000 | ​ | £000
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Level 1 |  | Level 2 |  | Level 3
Convertible Senior Secured Notes |  | — |  | — |  | 92,450 |  | — |  | — |  | 112,799
Warrant liabilities |  | 6,187 |  | — |  | — |  | 10,730 |  | — |  | —
​ |  | 6,187 |  | — |  | 92,450 |  | 10,730 |  | — |  | 112,799
Schedule of measurement inputs for level 3 fair value financial liabilities | The fair value of the convertible senior secured notes has been estimated using a binomial lattice framework. The following inputs have been used:
​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, 2022 |  | December 31, 2021 |
Risk-free rate |  | 3.00 | % | 1.25 | %
Dividend yield |  | — |  | — | ​
Volatility |  | 52.5 | % | 52.5 | %
Credit spread |  | 21.8 | % | 21.8 | %

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- Definition Schedule of measurement inputs for level 3 fair value financial liabilities + References No definition available. + Details
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- Definition The disclosure of the fair value measurement of liabilities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2021-01-01 -Paragraph 93 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2021-en-r&anchor=para_93&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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